A recently developed four-camera array was used for this project. This camera array employs four commonly found web cams which tie together at a powered USB hub. The USB hub allows for a single USB cord interface to the host PC. The cameras are arranged in a $2\times2$ grid with equal spacing between each camera. This setup allows for four images to be taken nearly simultaneously and with different camera settings for each image if desired. Each camera provides a different perspective of the scene that is being viewed. The camera array is shown in Figure \ref{fig:camera_array_no_plate}.

\begin{figure}[h!]
\centering
\includegraphics[width= 0.3\textwidth]{img/camera_array_no_plate}
\caption{$2\times2$ camera array that was used for the project}
\label{fig:camera_array_no_plate}
\end{figure}

The focus on each of the cameras can be adjusted by turning their lens which adjusts the distance of the lens from the imaging chip. Once the focus is set then a protective can be placed on to the unit which helps prevent the lens caps from being accidentally moved or damaged \ref{fig:new_camera_array}.

\begin{figure}[h!]
\centering
\includegraphics[width= 0.3\textwidth]{img/new_camera_array}
\caption{$2\times2$ camera array with the lens protector in place}
\label{fig:new_camera_array}
\end{figure}